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 TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-16. Macerator Pump - Troubleshooting
NOTE
Refer to paragraph 4-15 for maintenance instructions.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Pump runs but does not deliver capacity.
Observe operation of pump.
a. If motor is 3 phase impeller rotation may be wrong. Interchange any two line
leads to motor.
b. Impeller or grinder ring may be clogged with solids. Remove pump from line and
check for clogging.
c. Discharge head may be too high. Check vertical elevation from sump level to
point of discharge. A pressure gage attached to discharge line outside sump will
indicate line pressure. Pounds pressure times 2.31 = feet head. Check
performance table for maximum pump head.
2. Pump does not operate.
Observe operation of pump.
a. Check fused disconnect and verify that power is coming into the starter box.
b. Check performance of the time control circuitry.
c. Check reset on starter box.
d. On single phase pumps, check start capacitors in starter box.
e. Remove pump from line and check for clogged pump volute or jammed impeller.
4-61
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